LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2001 >> MPV ES >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1518: IMRC Shutter Valve Stuck Open >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P1518: IMRC Shutter Valve Stuck Open: Testing

NOTE: Record freeze frame data. Check for service bulletins and on-line information.
  1. Using scan tool, clear DTC. Ensure transmission is in Park. Turn ignition off. Start engine. Accelerate engine to more than 4000 RPM for 5 seconds. Allow engine to idle. Recheck DTCs. If DTC P1518 is pending, go to next step. If DTC P1518 is not pending, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Check IMRC valve position. If IMRC valve lever is closed, problem is electrical. Go to next step. If IMRC valve lever is open, problem is IMRC valve sticking. Check and repair as necessary. Go to step  9 .
  3. Turn ignition on. Check IMRC valve position. If IMRC valve lever is open, problem is in control circuit. Go to next step. If IMRC valve lever is closed, problem is in monitor circuit. Go to step  6 .
  4. Turn ignition off. Disconnect IMRC actuator connector. Check IMRC actuator and IMRC actuator harness connector terminals. If problem is not present, go to next step. If any problem is present, repair as necessary. Go to step  9 .
  5. Check continuity between IMRC harness connector terminal No. 1 (Black/Red wire) and ground. If continuity is not present, go to step  9 . If continuity is present, repair short to ground in wiring between IMRC harness connector terminal No. 1 (Black/Red wire) and PCM harness connector terminal No. 42 (Black/Yellow wire). See Figure . See WIRING DIAGRAMS article. Go to step  9 .
  6. Turn ignition on. Using scan tool, access IMRCMTR PID. Disconnect IMRC harness connector. If PID does not change from on to off, go to next step. If PID changes from on to off, replace IMRC actuator and go to step  9 .
  7. Check IMRC actuator and IMRC actuator harness connector terminals. If problem is not present, go to next step. If any problem is present, repair as necessary. Go to step  9 .
  8. Turn ignition off. Check continuity between IMRC harness connector terminal No. 5 (Black/Blue wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground in wiring between IMRC harness connector terminal No. 5 (Black/Blue wire) and PCM harness connector terminal No. 3 (Red wire). See Figure . See WIRING DIAGRAMS article. Go to step  9 .
  9. Reconnect all components. Using scan tool, clear all DTCs. Turn ignition off. Start engine. Accelerate engine to more than 4000 RPM for 5 seconds. Allow engine to idle. Recheck DTCs. If same DTC is pending, replace PCM and go to next step. PCM is mounted to passenger floor, behind glove box. If same DTC is not pending, go to next step.
  10. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If DTC is not present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
scientia non olet · About LEMON Manuals